This is the story of a good, kind, and respected man who at age 40, through no fault of his own aside from exhaustion due to overwork, becomes a murderous, bloodsucking fiend when in total darkness because his mother was bitten by a vampire bat the day she gave birth to him. I guess that's no more of a stretch than the premise behind The Wolf Man
. Professor Kristan commits suicide when he fully realizes he is the monster, while Larry Talbot preferred to anguish over his deeds until killed by his father.
The acting here is mostly good. Maxine Doyle performed poorly in the female lead. The dialog is stilted at times. It's well-paced and maintained my interest all 65 minutes, partly because I wanted to know how Professor Kristan would meet his end. Frank Strayer also directed The Vampire Bat
, a better film, but with it's own problems.
I downloaded the DivX file, which is actually an AVI. The video is adequate with compression artifacts often visible. The audio is good.